[PLANTMAN]

I changed my brake pads on my1997 3500hd.tb 4 wheel drive now i have a mooing sound comming from brake booster ,anti lock moudle area??
squezzed calipers with c clamp with resiviwar lid off.was carfull with anti lock speed ??sensors.also replaced universals in front 4 wheel hubs. Brake light went off with the new brake pads. No anti lock light. My gmc has single piston ,4 wheel rotors, bendicks caliper ,dual master cylinder,hydrolic assisted through steering pump,anti lock spaceship moudlelator ??? help.....:help2: also dtc code 0236 tbo sensor ,found broke hose at wasgate acctulator. No vacum orderd map sensor. Checking in to both promblems more. Diagnotics and dtc code from fourm has been very helpfull.

 

[gmctd]

Check you power-steering fluid level, recheck your brake-fluid level in the reservoir - refill as necessary

 

[PLANTMAN]

Fluid levels ok

 

[Diesel-T]

Sounds like abs sensor.Pull abs fuse to see if mooing goes away.

 

[PLANTMAN]

Thanks diesel-t ,i will try removing fuse tommorow . Does your dually have hydrolic assisted brakes?

 

[gmctd]

Or, just let it bleed the trapped air thru the system - that's what's happening when the groaning sound occurs.

 

[PLANTMAN]

Thanks deisel-t ,tried bleeding drakes still mooing ,took out abs 60 amp fuse, it quit mooing air traped in anti lock brake somewhere??? is their a small cheap sensor somwhere in abs system i am overlooking???? maybe i broke a abs speed sensor behide brake rotor (was realy carefull with sensor )but had alot of metalic brake shavings stuck to it.cleaned off before reinstalling. Any procedure to locate or narrow down to a specific sensor in the abs system

 

[PLANTMAN]

A little more info looked closer at my abs module,found out i have kelsey-hayes hydrolic anti lock brakes system. Yeah ,hummmmm my moto heavy truck repair manual descibes system,led diagnostic and testing ,dtc code interpretation yeaaaaaa.....-:t No brake codes (btc)came up the other day at advance autoparts when scanned.no brake or anti brake light after warm up(start up) motor repair manual says no provisions for flash code dtc's??????? ill have to check in about "flash code dtc'' what a mess. I will check my front wheel speed sensors wires conections tommorrow.
Any coments welcome.:help:

 

[Diesel-T]

My truck is not HD.Dont know similaritities/diffs between 3500 &3500HD re brakes.When mine acted up(mooing/groaning when brakes applied at low speeds) I pulled. fuse & drove with out abs.Cost of sensor(may be part of hub )is wild.

 

[crowne]

Here's a great article on how to replace the hub.

http://dieselplace.com/forum/showthread.php?t=71798

 

[PLANTMAN]

Thanks desiel-t,crowne
my 3500hd front 4 wheel ,drive, brake,rotor,asembely is a lot bigger than a 2500 hd 4 wheel drive.see picture in my "garage" under gmc 3500 hd. My front rotor and hub comes a part in two pieces and weight about 80lbs.tools are all standard ,also have 2 21/2 jamb nuts with lock washer with bendable tabs, holding on rotor and hub. Still need to work on brakes
i guess i need to have truck re scaned with a better dtc.scanner to have code(s) read. I have a ""motor" heavy duty meddium truck repeir mannual explaining dtc. Codes for my kersler-hasyes anti lock brake moudle . Mannuals says no provision for "flash type dtc scanners" took out 60 mp fuse out of anti lock fuse slot brakes work fine.anti lock light now on

 

[PLANTMAN]

Had my 3500 hd rescanned with a better scanner ,however cdt codes were speratic and not always the same with truck running and brakes appilied. Looking into a little further.person(s)scaning my truck thinks their might be debrie (trash)stuck in the abs moudle itself.not sure or if trash chould be flused out. Here is a web site that rebuilds certain abs.moudles for anyone else having abs modular promblems.absfixer.comit will save you some dough. I 99% sure my promblem is in the abs moudle,but not sure if in hydrolic part or in eletrical part of abs modular .being that my brake promblems/codes are speratic. Keep you posted on progress,my truck being heavy and hauling a trailer and having emplyoees the abs is pretty important to me.